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Foundations of Software Testing: Fundamental Algorithms and Techniques
book

Foundations of Software Testing: Fundamental Algorithms and Techniques

by Aditya P. Mathur
March 2007
Intermediate to advanced content levelIntermediate to advanced
709 pages
20h 23m
English
Pearson India
Content preview from Foundations of Software Testing: Fundamental Algorithms and Techniques
Test-Adequacy Assessment Using Program Mutation
7.10.10.8 Twiddle Mutations
Values of variables or expressions can often be off the desired value by
±1. The twiddle mutations model such faults. Twiddle mutations are use-
ful for checking boundary conditions for scalar variables.
Each scalar reference x is replaced by pred(x) and succ(x), where pred
and succ return, respectively, the immediate predecessor and the imme-
diate successor of the current value of the argument. When applied to
a float argument, a small value is added (by succ) to, or subtracted (by
pred) from, the argument. This value can be user defined, such as ±.01,
or may default to an implementation-defined value.
Example 7.43: Consider the assignment: p = a + b. Assuming that
p, a, and
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Publisher Resources

ISBN: 9788131707951